The publisher of the Granville Market Letter since 1963, Mr. Granville predicted the Dow’s slide in 1977 to 1978 and the end to the surge in computer-related shares in 2000. He was wrong in 1982 and 1995 when he called for losses before stocks rallied.

In his forecasts, Mr. Granville used criteria such as trading and price patterns, rather than more commonly analyzed economic data and earnings growth. He started developing his own stock- market theories at what was then E.F. Hutton & Co., a New York- based brokerage, from 1957 to 1963.

By 1981, Mr. Granville was influential enough to spur a market slump. That January, he sparked a 2.4 percent one-day decline in the Dow average by advising, “Sell Everything!”